c6711_edma.c

该代码实现了 两次下载法在dspC6713平台上 烧写flash的操作过程

/*****************************************************************************
* File name :     C6711_EDMA.c
* Description:
******************************************************************************/
#ifndef MASTER_FILE
#define C6711_GLOBALS
#include "includes.h"
#endif

#include "EDM.H"

static unsigned short channel_used_flag=0x0000;

#define LINKED 0x12345
/******************************************************************************
* Function   : edma_init()                                                   
* Description: This function  initialize the selected event Parameters RAM   
******************************************************************************/
void edma_init(
             unsigned short chan,      
             unsigned int opt, 
             unsigned int src_addr,
             unsigned int element_count,
             unsigned int frame_count,  
             unsigned int dst_addr,  
             unsigned int element_index,    
             unsigned int frame_index,
             unsigned int elecnt_reload   
             )
{
 EDMA_OPT_WRITE(chan,opt);  
 EDMA_SRC_WRITE(chan,src_addr); 
 EDMA_DST_WRITE(chan,dst_addr); 
 EDMA_ELECNT_WRITE(chan,element_count); 
 EDMA_FRMCNT_WRITE(chan,frame_count);  
 EDMA_ELEIDX_WRITE(chan,element_index); 
 EDMA_FRMIDX_WRITE(chan,frame_index); 
 EDMA_ELERLD_WRITE(chan,elecnt_reload);        
 channel_used_flag|=(1 << chan);               /* Set channel_used_flag */
 
}

/******************************************************************************
 Function   : edma_reset()                                                  
 Description: This function reset the selected event Parameters to 0.        
******************************************************************************/
void edma_reset(unsigned char chan)
{
 EDMA_OPT_WRITE(chan,0);  
 EDMA_SRC_WRITE(chan,0); 
 EDMA_DST_WRITE(chan,0); 
 EDMA_ELECNT_WRITE(chan,0); 
 EDMA_FRMCNT_WRITE(chan,0);  
 EDMA_ELEIDX_WRITE(chan,0); 
 EDMA_FRMIDX_WRITE(chan,0);
 EDMA_LINK_WRITE(chan,0); 
 EDMA_ELERLD_WRITE(chan,0); 
 channel_used_flag&=(~(1 << chan)); /* Clear channel_used_flag */
 
}

/******************************************************************************
* Function   : edma_pri_set()                                                
* Description: This function set channel Priority levels for EDMA events     
*              only level1 and level2 is available for EDMA.                 
*              001b Level1: high priority                                    
*              010b Level2: low priority                                       
*****************************************************************************/
void edma_pri_set(unsigned char chan)
{
 if(edma_pqsr_query(1))
   OPT_PRI_WRITE(chan,1);
 else
   OPT_PRI_WRITE(chan,2);
     
}

/******************************************************************************
 Function   : edma_link()                                                   
 Description: If LINK=1, upon completion of a transfer, the function reloads
              the current transfer parameters with the parameter pointed to 
              by the 16-bit link address.                                   
              the last transfer parameter entry should have its LINK=1 and  
              last entry should be linked to a NULL parameter set,so that   
              the linked transfer stops after the last transfer.            
              The link address must be aligned on a 24-byte boundary.       
 Parameters: chan------------the first channel needing parameter linking.   
             chan_link[16]---list of channel will be linked,its             
                             corresponding flag is LINKED(0x12345).         
             null_para_addr--the address of NULL parameter set.             
******************************************************************************/
BOOLEAN edma_link(unsigned char chan,
                  unsigned char chan_link[16], 
                  unsigned int null_para_addr
                  )
{
 unsigned int link_addr;
 unsigned int i,j,link_num=0;
 BOOLEAN link_finish;  
 j=chan;
 
 for(i=0;i<16;i++)
 {
   while((chan_link[i]!=LINKED)&&(i<16)) i++;
   
     link_num++;        /**/
   if(i=chan)                   /* autoinitialization to facilitate the use of */
     {                          /* circular buffering and repetitive transfers */
      if(link_num==0)
       {
         link_addr = EDMA_EVENT_PARAMETER(chan);
         link_finish=TRUE;
         break;
       }
      else 
        {
         link_finish=FALSE;
         break;
        }
     }          
   else
    {
      link_addr = EDMA_EVENT_PARAMETER(i); 
      EDMA_LINK_WRITE(j,link_addr); 
      j=i; 
      EDMA_SYNC_DISABLE(i);
      OPT_LINK_ENABLE(i);
    }
 }

 if(link_num)
 {
   EDMA_LINK_WRITE(j,null_para_addr);
   link_finish=TRUE;
 }
 return link_finish;
 
}

/******************************************************************************
 Function   : edma_chain()                                                  
 Description: Enable an events that is driven by a peripheral or external       
              device to trigger an EDMA transfer through chain several EDMA 
              channels from one event.                                      
 Parameters: chan---the channel needing chaining.                           
             event--Interrupt event to trigger a EDMA transfer.                  
******************************************************************************/
BOOLEAN edma_chain(unsigned char chan,unsigned char event)
{
 BOOLEAN chain_finish;
 
 if(!((1<<chan)&0x0f00))  /* Only channel 8,9,10,11 can be triggered */
    chain_finish=FALSE;
 else
 {
 /*Assign channel number to TCC of the event entry parameter */
  OPT_TCC_WRITE(event,chan);
 /*Enable the event's Corresponding Channel transfer complete interrupt */ 
  OPT_TCINT_ENABLE(event);  
 /*Enable channel chain */
  EDMA_CHAIN_ENABLE(chan);
   
  chain_finish=TRUE;
 }
 return chain_finish;
 
}

/******************************************************************************
 Function   : edma_int_map()                                                  
 Description:             
******************************************************************************/
void edma_int_map(unsigned char intr_flag,
                  unsigned short intr_chan)
{ 
  int i;
   
   for(i=0;i<16;i++)
   {
      if(intr_chan&(1<<i))
      {
       OPT_TCC_WRITE(i,intr_flag);
       OPT_TCINT_ENABLE(i);
      }
    }
   
   EDMA_INT_ENABLE(intr_flag); 
      
}

/******************************************************************************
 Function   : edma_intr_query()                                                  
 Description: Query if there pending events corresponding to EDMA interrupt            
******************************************************************************/
unsigned char edma_intr_query()
{
  int i=0;
  
  while((EDMA_INTFLAG_READ(i))&&(i<16)) i++; /*Find the interrupt event */
  
  if((i>=0)&&(i<16))
  {
    EDMA_INTFLAG_CLR(i);        /* Clear the event's interrupt flag */
    return i;                  /* return the interrupt event number */
  }
  else
    return 0xFF;
    
}


/* END OF FILE */